To overcome this, many 3D printer manufacturers have taken extreme measures to increase bed adhesion. In conventional processing techniques, this dimension change is easily accounted for and is widely understood. Its crystalline segments are almost completely resistant to further chain diffusion and entanglements. Like most semi-crystalline materials, it undergoes a significant dimensional change (shrinkage) when it crystalizes. PEEK is a highly crystalline material with very fast crystallization kinetics. This results in better dimensional accuracy and layer adhesion for FFF objects. Indeed, amorphous polymers undergo less dimension change when cooling, and the disordered structure allows some diffusion and entanglement between polymer chains in adjacent layers. Semi-crystalline: semi-crystalline polymers contain both disordered, amorphous regions as well as crystalline domains where the chains arrange into ordered patterns.Īlmost all polymers used in FFF fall into the category of amorphous materials as they are far easier to process than semicrystalline materials.The analogy often used is a bowl of cooked spaghetti. Amorphous: amorphous polymers are simply tangled messes of long molecules.Plastic materials can be divided into two categories: Amorphous and semi-crystalline thermoplastics: what’s the difference? However, many of the properties that make it so appealing for these processing techniques make it incredibly difficult to process in FFF (fused filament fabrication). The desire to print PEEK is understandable, as it is often the go-to high-performance material for stock shape machining or injection molding. Over the past few years, there has been lots of buzz over 3D printers that can process PEEK (polyetheretherketone), one of the most widely known ultra-high performance polymers.
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